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Equipment BL-201A
FM fm_3
ISO 14224 mode FTS Fail to start on demand
Source OPC Ontology KB
Relief Valve Set-pressure Drift
BL-201A · Boiler
Related equipment → BL-201A
0.82Source conf.
0.65Evidence conf.
FTSISO 14224 mode
1Failure Mechanism
Function:实现设备功能
Failure cause:弹簧长期处于应力状态产生蠕变；整定螺丝松动或腐蚀；阀座积垢影响动作
Damage mechanism：安全阀弹簧应力松弛/蠕变（creep of spring）致整定压力漂移；整定螺丝腐蚀/松动
2Source Basis (where this FM comes from)
OPC Ontology KBCSB Accident DBQuant benchmark
Source confidence 0.82: this FM is derived from the ontology KB and cross-validated by OPC Ontology KB·CSB Accident DB·Quant benchmark.
3Evidence Chain (supporting basis)
Evidence text：None
Evidence conf.：0.65 · Evidence source：engineering_estimate
Governing standards (evidence)：std:API-576 — API 576 — Inspection of Pressure-Relieving Devices · 安全阀/泄压装置检验std:ASME-BPVC-I — ASME BPVC Section I — Rules for Construction of Power Boilers · 锅筒/受热面建造与检验规则（PG-19 等）std:API-572 — API 572 — Inspection Practices for Pressure Vessels · 压力容器检验实践
4Related Real Accidents (traceable to accident cards)
This FM is recorded in 2 real accident investigation(s); tap the report no. to open the corresponding accident lesson card.
5Applicable Standards & Clauses
API 580GB/T 7826-2012ISO 14224:2016SAE JA1011_202411
Standard clause references (19):
GB/T 7826-2012GB/T 27921-2011GB/T 44958-2024GB/T 4888-2008GB/T 29639-2020AQ/T 3034-2022API 581API 580API 510API 571API 579-1/ASME FFS-1API 754API 576API 689API 755ISO 14224:2016ISO 20815:2018IEC 61511:2016ISO 31000:2018
6Derived Analysis (seeded from this FM)
9/7/4FMEA Sev/Occ/Det
0.46RBI λ
0.8Monitor pdet
4 月Insp. int.
Current tasks:每年在线校验起跳压力 | 每半年检查弹簧外观及尺寸 | 每次动作后记录动作次数并分析趋势
RCFA incident:BL-201A 发生起跳值偏移，严重程度 9，后果类型 Safety/Environmental
7RCM Maintenance Decision (strategy landing)
CBMOn-Condition Maintenance
Recommended task蠕变测量/金相监测, 按剩余寿命管理; 无损检测(UT/MT/PT) 监测裂纹萌生, 关键转动件定时拆检; 无损检测(UT/VT/MT/PT), 按 API 581 RBI 风险定级设定检验间隔; 按压差/效率监测设定清洗周期 + 过滤/防堵维护
Suggested intervalHigh risk 1-3 mo / Medium 6-12 mo / Low risk at turnaround (by API 581 RBI risk ranking)
Decision basis机理类别=corrosion; creep; fatigue; fouling
Governing standardsAPI 530API 570API 571API 579API 581API 612ASME IIIASME VIII厂家规范
⚠ This decision is engineering-inferred by RCM logic from the damage mechanism / root cause / failure cause — it is not derived from measured site history. Confirm with the equipment owner and process before execution.
⚠ 本卡技术正文（功能 / 致因 / 损伤机理 / RCFA 叙事）保留中文原文——依可信 AI 红线，自由技术文本不自动机翻、不编造英文译文。UI、设备类型、FM 名、ISO 码、标准号均为英文。